Automatic pressure-controlling valve device.



J. W. DAWSON.

AUTOMATIC PRESSURE CONTROLLING VALVE DEVICE.

APPLICATION FILED JUNE 18,1912.

LOMfiOO. Patented Dec. 17,1912.

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J W. DAW$0N.

AUTOMATIC PRESSURE CONTROLLING VALVE DEVICE.

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L%? 5@ Patented Dec. 17,1912.

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J. W. DAWSON.

AUTOMATIC PRESSURE CONTROLLING VALVE DEVICE.

APPLIOATION FILED JUNB18,1912.

1 47 56 Patented De0.17,1912. 3 BHBETSSHEET 3.

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41; I I R j JAMES W. DAWSON, OF CHICAGO, ILLINOES.

AUTOMATIC? PRESSURE-GONTROLLIBYG VBJJV-E DEV-ICE.

Specification of Letters Eatcnt.

itatented Dec. t '21,

Application illed June 18, 1912. Serial 1S0. 704,388.

To all whom it may concern:

Be it known that 1, JAMES W. Dawson, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented a new and useful Improvement in Automatic Pressure-GontrollingValve Devices, of which thefollowing is a specification.

The primary object of my invention is to provide a construction ofvalve-device, whereby a valve in the sage is held normally wide open bythe pressure in the system exerted againstaflexiblc diaphragm, thelimited extent of movement of which is transmitted to the valve ingreatly augmented degree througlrthe medium of suitable mechanism,interposed between the valve and diaphragm, and the valve seatsautomatically to close the passage upon a reduction oi ,the pressureagainst the diaphragm, as by a break in the system. 1 l i In theaccompanying drawings, Figure 1 is a View in elevation showing part ofjarefrigerating system equipped with my irn provement; Fig. 2 shows myimproved device by a sect-ion taken on line 2, Fig. 4:, and enlarged;Fig. 3 is a view of the; device in sectional elevation, the sectionbeing taken on line 3, Fig. 4; Fig. & is a plan View of the same, andFig. 5 is an enlarged broken section on line 5, Fig.3. f

The valve and its operating mechanism are housed in ceasing 6 shown as asingle casting with flanged end and a cap 8 on its upper, end, having asleeve-like dependin extension 9 containing a central borelO or-thevalveguiding purpose hereinafter referred to. The passage 11 for thepressure-fluid of the system is formed with the inlet at 12, the outletat 12 and a seat at 13 for the valve 14 controlling communicationbetween the inlet and outlet. A spring 15 about the extension 9 isconfined against the valve for seating it; and the valve has aguide-stem 16 extending from its upper side into the bore 10, and adepending valve-steno17 working in a sleeve 18 in the base-wall 19 ofthe-passage 11, which separates the latter from the lower casing-chamber20 closed by the head 7 In this chamber is confined about its edge, bythe head 7, a flexible metal diaphragm 21,. shown to be corrugatedthough the extent of its movement is, so slight as to rendercorrugations unnecessary: A pispressure-fluid pasa head '7 bolted toits-lower,

pipe 34: against the ton head 22 in the chamber bears against the innerface of the diaphragm, being carried by the latter, and has formed onits inner face an annularfiange 23 provided at diametrically-oppositepoints with vertically-recessed upright ears 24: for "the purposehereinatter explained. Studs 25, 25 are screwed into. the upper wall ofthe chamber -20 to depend therein at diametrically-o iposite pointsalining with the cars 24:, an to each stud are pivotally fastened, toembrace it, a pair of arms forming a lever 26, these arms containinglongitudinal slots '27 in their inner ends, which extend nearly to thevertical center of the chamber, where they are pivotally connected withopposite ends of a head 28 on the lower end of a plunger-stem 29 workingin the sleeve 18 through a stufling-box 18 therein. The lever-armstraverse and find bearing in the ear-recesses 24E.

Pressure-fluid enters the passage through a pipe 30 suitably coupled tothe inlet 12' to discharge at the outlet 12 through a pipe 31 suitablycoupled there with, thesepipes being connected by a by.- pass 32containing a valve 33 between its ends; and a pipe 34 leads, from apoint in the system in advance of the valve 1 1, centrally into thebottom of the chamber 20, (at 35, Fig. 2) beneath the diaphragm.

In fact, if my improved valve-device he employed, say, in a water orsteam pressure system, the pipe 34 might lead to the point 35 irom .thedischargepipe 31, since in the event ot' a break occurring in that pipe,the

ressure through the iaphragm would permit the pressure in the pipe 30,supplemented by the spring 15, to seat the valve consequent loss of and.thus shut oil the flow. In that connec- Y tion, the stuttingbox 18prevents leakage through the sleeve 18 upon the head 22, which wouldtend to counteract the pressure against the under side of the diaphragmand thus impair the operation of the valve-device.

Fig. 1 shows my improved device incorporated in a refrigerating machinein gen eral use, for which connection I have more especially adapted it.The represents the compressor at 37, with the dischargepipe 38- having acheck-valve 39 and an oil-trap 4O interposed in it, and the suctionpipes30, 31 having interposed be- ;tween them my valvedevice with the pipeillustration;

31 containing a strainer 41 from which apipe 42 leads to the gage (notshown), to which also leads a pipe 4C3 from a valve 43 on thedischarge-pipe A pipe e l leads from a valve 45 on the oil-trap 4-0tothe oilseparator (not shown), and a pumpsout pipe 46 leads from abranch 31 of the suction-pipe. 4 The pipe 3st of mydevice leads from thedischarge-pipe 38, adjacent to the check-valve 39, thus from the highpressure side of the machine, to the point 35 in my device. Theforegoing, reference, by numerals, to the different well-known parts ofthe refrigerating machine is merely to identify them.

In the operation of a refrigeratin plant equipped with my device, withthe y-pass valve 33 closed, as it is normally,- gas under pressure of,say, about thirty pounds, entering the passage 11 fromthe inlet 12through the suction-pipe 30 tends to seat the valve 14, but the pressureof, say, about one hundred pounds, from the dischargeside of thecompressor through pipe 34 against the under surface of the diaphragm21, of relatively-great area,'forces it against the head 22 to raise thelatter as far as the stops, afforded by the lower ends of the studs 25,will permit. These stops define the limit of movementof the diaphragm,which is very slight say three thirty-seconds of an inch; so thathowever great the pressure may be against the diaphragm, by pressingagainst the under piston-surface it cannot be overstrained. In the riseof the head 22 engagement of the ears 2A with the under sides of thelevers 26 near their 'inlcrums raises the levers toward their inner endsto a much greater extent than that of the diaphragm-movement-say to theextent of seven-eighths of an inchyanyway, suiticiently to fully openthe valve 14, since the movement of the levers is transmitted to theplunger-stem 29 which, in its rise, encounters the stem 17 and lifts thevalve. So long as suiiicient pressure remains in the pipe 34 to Work thediaphragm, the valve 14 is sustained in its fullyopened position;vbiit'the instant any break occurs in the system between my valve-deviceand the compressor, and particularly by blowing out a compressor-head,which is not an uncommon accident, the pressure in the pi e 34 is released, permitting the piston an levers with the stem 29 to drop and thevalve 14 to seat under the force of its spring. The valve thus shuts oilthe suction-pipe 30 and prevents the loss of gas from the coils of therefrigerating system. A slight clearance is shown at 36 (Fig. 2),between the adjacent ends of the stems 17 and 29, to insure full seatingof the valve 14. The by-pass 32 is used, by opening the valve 33therein, when, as is occasionally done, the rei'rigen ant is pumped outof the coils and there is scribed for embodying my improvement, and

I do not intend by illustrating a single, spa citic or preferred, formto limit. my invcntion thereto; my intention being in the Itch lowingclaims to claim protection for, all the novelty there may be in theimproved. device as broadly as the state of the art will permit.

lVhat I claim as new and desire tosecure by Letters Patent is- 1. In anautomatic valve-device oi? the characterdescribed, the combination of acasing having a pressure-fluid passage with an inlet and an outlet, aself-closing valve seating in said passage, a chamber in the casingcommunicating with the measurefluid-supply, a diaphragm in said chamberand a solid reciprocating head fitting therein and bearing against andcovering substantially the entire effective surface of the diaphragm andhaving limited movement, and lever-mechanism in said chamber interposedbetween the valve and piston to be actuated by the diaphragm to increaseby its movement that of the valve for unseating'it.

2. In an automatic valve-device of the character described, thecombination oil a casing having a prcssm-e-fluid passage With an inletand an outlet, :1 iselibclcsing valve seating in said passage, a chamberin the casing connnunieating with the pressur fluid-supply, a. diaphragmin said chamber and a solid reciprocating" head fitting therein andbearing; againstand covering snhstan tially the entire eli'ectivesurface of the dia phragm, stops in said chamber in the path oi the headto limit its movement and that of the diaphragm, and lcvenmechanism insaid chamber interposed between the valve and head to be actuated by thediaph 2159311 to increase by its movement that of the valve forun'seating it.

3. In an automatic valve-device of the character described, thecombination of a. casing having a pressure-fluid passage with an inletand an outlet, a self-closing valve seating in said'passage and providedwith a l stem, a chamber in the casing communicating with thepressure-fluid.-supply, a diaphragm in said chamber and aTQClfJlGCiitliflgg head fitting therein and bearing against and coveringsubstantially the entire effective surface of the diaphragm and havinglimit ed movement, levers fulcrumed in said. Cl1il1llher to extendtoward each other across the head in advance thereof, and a pl'ungenstcmpivotally connecting at one end the inner memes ends of said levers andextending atits opposite end to encounter the adjacentend of thevalve-stem, for the purpose set forth;

at. In an automatic valve-device of the character described, thecombination of a casing having a pressure-fluid passage with an inletand an outlet, at self-closing valve seating in said passage andprovided with astem, a chamber in the casing communicating with thenessure-fluid-supply, diaphragm in said chamber and a solidreciprocating head fitting therein and bearing against and coveringsubstantially the entire effective surface of the diaphragm, stops insaid chamber in the path of the head, ears on the inner face of thehead, levers fulcrumed at their outer ends to said stops to extendtoward each other across said ears, and a plungerstein pivotallyconnecting at one end the inner ends of said levers and extending at itsopposite end to encounter the adjacentend of the valve-stem, for thepurpose set forth.

5. In an automatic valve-device of the character described, thecombination of a casing having an upper transverse pressurefluid passagewith an inlet and an outlet, and a lower chamber with a vertical sleevein the wall between said passage and chamber, a self-closing valveseating in said passage and provided with a stem working in said sleeve,a diaphragm in said chamber and a solid reciprocating head fittingtherein and bearing against and covering substantially the entireeiiective surface of the diaphragm and having limited movement,

levers fulcrumed at their outer ends in said H an-aw" i H I i oi. .MWACopies ofthimstcntrmyh obtained for five cents each, by addresiiing;

Washington, I). G.

chamber to extend toward each other in the path of the plunger, and aplungenstem pivotally connecting atone end the inner ends of said leversand working at its opposite end in said sleeve to encounter therein thevalvcstem, for the purpose setforth.

6. In an automatic valvedeviec oi the character described, thecombination of a casing having an upper rap with a depending sleeve, anda head on its lower end, an upper transverse pressure fluid passagethrough the casing having an inlet and an outlet, a self-closing valveseating in said passage and provided with an upper guidestem in saidsleeve and adepending' valve stem, a lower chamber in the casing dividedfrom said passage by a wall containing a vertical sleeve in which thevalve stem works, said chamber communicating with thepressure-fluidsupply, a diaphragm in said chamber and a solidreciprocating head fitting therein and supported on andcoveringsubstantially the entire effective surface of the diaphragm,stops in the path of the head for limiting its movement, leversfulcrumed at their outer ends to said stops to extend toward each otherin the path of said head, and a plunger-stem pivotallv connecting at itslower end the inner ends of said levers and working at its upper end insaid vertical sleeve to encounter therein the valvestem, for the purposeset forth.

JAMES W. DAVSUN.

In presence of- J. G. ANDERSON, R. A. SOHAEFER.

the Goxnmtssioner of F5 cats tit)

